CN105041950A

CN105041950A - Piston assembly for shock absorber

Info

Publication number: CN105041950A
Application number: CN201510146259.1A
Authority: CN
Inventors: 金泓植
Original assignee: Mando Corp
Current assignee: HL Mando Corp
Priority date: 2014-03-28
Filing date: 2015-03-30
Publication date: 2015-11-11
Anticipated expiration: 2035-03-30
Also published as: DE102015205556A1; US20150276005A1; CN105041950B; KR20150112801A; KR101671967B1; DE102015205556B4; US9534653B2

Abstract

A piston assembly for a shock absorber includes: a bypass passage formed along a vertical length direction of a piston rod in a small-diameter portion that is stepped in a lower portion of the piston rod reciprocating within a cylinder; a main piston connected to the small-diameter portion; an orifice assembly coupled to the small-diameter portion and disposed under the main piston to form an orifice passage, which communicates with the bypass passage; a housing coupled to the small-diameter portion and disposed under the orifice assembly, the housing having an opened upper side and forming a pressure chamber; and a sliding valve coupled to the orifice assembly and accommodated in the pressure chamber to generate a damping force by selectively opening and closing the orifice passage while reciprocating through a high-frequency section and a low-frequency section. Accordingly, the piston assembly is capable of improving a ride comfort by exhibiting a damping performance over a low-frequency section and a high-frequency section.

Description

For the piston assembly of vibration damper

The cross reference of related application

This application claims the preference that on March 28th, 2014 is the korean patent application of 10-2014-0036719 to the application number that Koran Office submits to, it is incorporated to herein by the mode quoted as proof in full.

Technical field

The present invention relates to a kind of piston assembly for vibration damper, especially a kind of piston assembly for vibration damper that can be improved ride comfort sense by the damping capacity presented in low frequency part and HFS.

Background technique

Usually, vibration damper is used to the weight of support vehicle body and suppresses and cushion the vibration reaching vehicle body from road surface, and it contributes to the various parts improving ride comfort sense and protection Loaded goods and vehicle.

This kind of vibration damper comprises the cylinder filling working fluid (oil), is connected to the reciprocating piston bar of vehicle body, is connected to piston-rod lower end to slide in cylinder and to control the piston valve of the flowing of working fluid.

But in this kind of vibration damper, the component corresponding to low frequency part and HFS needs to install respectively.

Reference listing

Patent documentation

Application number is the korean patent application of 10-2011-0087171

Application number is the korean patent application of 10-2011-0142135

Summary of the invention

The present invention is devoted to solve the problem, and provides a kind of piston assembly for vibration damper, and it can improve ride comfort sense by the damping capacity presented in low frequency part and HFS.

According to one embodiment of present invention, the piston assembly for vibration damper comprises: bypass channel, and its vertical length direction along piston rod is formed in small diameter portion, and this small diameter portion is located at the bottom of reciprocating piston rod in cylinder; Main piston, it is connected to small diameter portion; Aperture member, it is attached to small diameter portion and is arranged on to form hole path below main piston, and this hole path is communicated with bypass channel; Housing, it is attached to small diameter portion and is arranged on below aperture member, and this housing has the upside mineralization pressure room of opening; Slide-valve, its be attached to aperture member and be placed in pressure chamber with when by when HFS and low frequency part to-and-fro motion by optionally open and close hole path formed damping force.

Aperture member can be one-body molded or removably can be connected to housing with housing.

Aperture member can comprise: cylinder, its be attached to small diameter portion and slide-valve by cylinder in low frequency part and HFS to-and-fro motion slidably; Multiple first hole, the top of its through-body is so that bypass channel is attached to the upper space of pressure chamber, and pressure chamber is divided into upper space and lower space by slide-valve; Multiple second hole, its bottom through main body is so that bypass channel is attached to the lower space of housing.

Dotted line through the center in multiple first hole can be arranged on the first plane, and can be arranged in the second plane with the first plane separation through the dotted line at the center in multiple second hole.

The volume of lower space can be greater than the volume of upper space.

The diameter in the second hole can be greater than the diameter in the first hole.

At HFS, slide-valve can make the first hole and the second hole remain on open mode.

In low frequency part, slide-valve can move up to cut out the first hole.

The amount by the working fluid introduced from bypass channel in the second hole of HFS can be greater than by the amount of the working fluid introduced from bypass channel in the second hole of low frequency part.

Slide-valve can comprise: elevator, and it is along the outward edge to-and-fro motion of aperture member; Valve block, it is given prominence to the upper surface of ring-type from elevator, and valve disc is arranged on valve block; And guide pad, its edge along elevator extends and towards the inner side of housing.

Slide-valve can also comprise multiple plate seam, its formation direction along valve block is cut and is allowed the flowing of working fluid, this working fluid is introduced from bypass channel by first hole on the top through aperture member, wherein at HFS, first hole is remained on open mode so that working fluid is discharged from plate seam by slide-valve, and in low frequency part, the first hole is remained on closed condition so that working fluid is not discharged from plate seam by slide-valve.

Piston assembly can also comprise O type ring, and it to be arranged between guide pad and the inner side of housing and to prevent the leakage of working fluid.

Piston assembly can also comprise block piece, and it is formed in the top edge in the second hole of the bottom through aperture member and prevents elevator from moving down.

Housing can comprise: base plate, and it is attached to small diameter portion to form bottom surface; Spacing wall, it upwards extends with mineralization pressure room from bottom edge; Multiple second intercommunicating pore, it passes base plate and allows working fluid to flow to the outside of the base plate in low frequency part.

Accompanying drawing explanation

Fig. 1 is the cross sectional representation of the overall arrangement representing the piston assembly for vibration damper according to an embodiment of the invention.

Fig. 2 is the amplification cross sectional representation of the critical piece of the piston assembly for vibration damper represented according to another embodiment of the invention.

Description of reference numerals:

100: bypass channel 200: main piston

201: rebound channel 202: pressure channel

300: aperture member 310: main body

315: block piece 321: the first hole

322: the second holes 400: housing

401: pressure chamber 401a: upper space

401b: lower space 410: base plate

412: the second intercommunicating pores 420: spacing wall

500: slide-valve 510: elevator

520: valve block 530: plate stitches

540: guide pad 600: piston rod

610: small diameter portion 700: suction valve

710: the first intercommunicating pores 800: valve disc

C: cylinder D1: the first coils assembly

D2: the second dish assembly O:O shape ring

P1: the first plane P 2: the second plane

R1: the first guard ring r2: the second guard ring

R3: the three guard ring W: packing ring

Embodiment

Advantages and features of the invention and implementation method will be more readily apparent from from the following embodiment described in detail by reference to the accompanying drawings.

But the present invention is not limited to following examples, and numerous embodiments can be had.

There is provided these embodiments so that open more comprehensively with complete, and scope of invention is conveyed to those skilled in the art more fully.

That encloses claims defines scope of the present invention.

Therefore, in certain embodiments, the detailed description to known elements, operation and technology will be omitted, because they can unnecessarily fuzzy theme of the present invention.

In whole disclosing, identical reference character refers to identical element.The object of the term that the present invention uses just in order to describe specific embodiment, is not limited to the present invention.

In this manual, singulative " " and " being somebody's turn to do " can be also plural forms, and it only represents odd number unless clearly indicated.Be appreciated that term as " comprising ", comprise and " having ", when used herein, regulation element and the existence of operation are described, but do not get rid of existence or the increase of one or more element and operation.

Unless otherwise defined, all terms here used, comprise technology and scientific and technical terminology, have the identical meaning usually understood with inventive concept those of ordinary skill in the field.

Further understanding, term, as the term defined in general dictionary, is construed as the meaning that the meaning that has with it in the context of association area is consistent, and can not be interpreted as the Utopian or too formal meaning, unless clearly defined at this.

Below, the preferred embodiments of the present invention are described with reference to the accompanying drawings.

As a reference, about the center line that the dot and dash line along Fig. 1 center represents, the left side of Fig. 1 illustrates the characteristic at the element of HFS, in HFS, working fluid applied pressure is low, and the right side of Fig. 1 illustrates the characteristic of element in low frequency part, in low frequency part, working fluid applied pressure is high.

At this moment, the solid arrow represented along each passage comprising bypass channel 100 in the left side of Fig. 1 represents the flowing state at the working fluid of HFS, and the dotted arrow representative represented on the right side of Fig. 1 is in the flowing state of the working fluid of low frequency part.

As shown in the figure, the piston assembly for vibration damper according to the present invention has a kind of structure, in the structure shown here, is wherein formed with the piston rod 600 of bypass channel 100, main piston 200, aperture member 300, slide-valve 500 and housing 400 order and connects and fix.

First, bypass channel 100 is formed along the vertical length direction of piston rod 600 in small diameter portion 610, and small diameter portion 610 is located at the bottom of reciprocating piston rod 600 in cylinder C.

Main piston 200 is attached to small diameter portion 610 and presents main damping capacity when making working fluid flow in compression stroke and rebound stroke.

Aperture member 300 is attached to small diameter portion 610 and is arranged on below main piston 200.Aperture member 300 defines hole path, and it is communicated with bypass channel 100, perpendicular to the reciprocating direction of piston rod 600.

A part for aperture member 300 is blocked together with the slide-valve 500 that will describe below or is discharged the introducing of working fluid of bypass channel 100 of comfortable HFS and low frequency part.

Housing 400 is attached to small diameter portion 610 and is arranged on below aperture member 300.Housing 400 has the upside mineralization pressure room 401 of opening.Housing 400 provides the space of the operation for above-mentioned slide-valve 500.

Slide-valve 500 is attached to aperture member 300 and is placed in pressure chamber 401.When by HFS and low frequency part to-and-fro motion, slide-valve 500 produces damping force by optionally opening and closing hole path.

As a reference, pressure chamber 401 is the spaces formed by the housing 400 with the upside of opening, and it should be understood that as the Ye Shi pressure chamber, space 401 between the slide-valve 500 of opening and closing comprising following aperture member 300 and the valve disc 800 that will describe.

In addition, slide-valve 500 participates in the flowing of working fluid hardly, and only in rebound stroke and compression stroke, participates in the flowing of working fluid together with aperture member 300 and housing 400.

Except above-described embodiment, below multiple embodiment also can be applied to the present invention.

Piston assembly according to the present invention comprises packing ring W, it is attached to small diameter portion 610 and is arranged on main piston 200, with the first intercommunicating pore 710, it is attached to small diameter portion 610 and is arranged on below packing ring W to make operating fluid crosses rebound channel 201, and comprising suction valve 700, it closes pressure channel 202 that the Vertical direction along main piston 200 penetrates and in compression stroke, opens pressure channel 202 in rebound stroke.

First guard ring r1 is attached to small diameter portion 610 and is arranged between packing ring W and suction valve 700.Therefore, when working fluid is introduced by the main piston 200 performing compression stroke and rebound stroke or discharged, the first guard ring r1 can provide stable working zone when the distortion of not interference intake valve 700.

First dish assembly D1 is attached to small diameter portion 610 and is arranged on below main piston 200.

In rebound stroke, the first dish assembly D1 is communicated with the rebound channel 201 of main piston 200 always, but the opening degree of the first dish assembly D1 depends on the flow velocity (flow) of working fluid.

That is, at HFS, the flow of working fluid is little and the flow velocity of working fluid is fast.Therefore, the first dish assembly D1 is communicated with rebound channel 201, but the opening degree of the first dish assembly D1 is little.But in low frequency part, the flow of working fluid is large and the flow velocity of working fluid is slow.Therefore, the first dish assembly D1 is communicated with rebound channel 201, but the opening degree of the first dish assembly D1 is large compared with HFS.

Valve disc 800, it is connected by small diameter portion 610, is arranged on below the first dish assembly D1.Slide-valve 500 moves up in low frequency part and raises valve disc 800.

Now, the second guard ring r2 is attached to small diameter portion 610 and is arranged between the first dish assembly D1 and valve disc 800.Second guard ring r2 maintains a gap, provide a clearances the smooth working region of the first dish assembly D1.

In addition, the second dish assembly D2 is attached to small diameter portion 610 and is arranged on below housing 400.

In rebound stroke, the second dish assembly D2 is communicated with the pressure chamber 401 of housing, but the opening degree of the second dish assembly D2 depends on the flow velocity (flow) of working fluid.

That is, at HFS, the flow of working fluid is little and the flow velocity of working fluid is fast.Therefore, the second dish assembly D2 is communicated with pressure chamber 401, but the opening degree of the second dish assembly D2 is little.But in low frequency part, the flow of working fluid is large and the flow velocity of working fluid is slow.Therefore, the second dish assembly D2 is communicated with pressure chamber 401, but the opening degree of the second dish assembly D2 is large compared with HFS.

3rd guard ring r3 is attached to small diameter portion 610 and is arranged between housing 400 and the second dish assembly D2.3rd guard ring r3 maintains a gap, provide a clearances the smooth working region of the second dish assembly D2.

On the other hand, as mentioned above, aperture member 300 has hole path, and it is communicated with bypass channel 100 and comprises main body 310 and the first hole 321 and the second hole 322.

As a reference, pressure chamber 401 is divided into upper space 401a and lower space 401b by following slide-valve 500.

First, main body 310 is attached to small diameter portion 601.Main body 310 is cylindrical members, slide-valve 500 by cylindrical member in low frequency part and HFS to-and-fro motion slidably.

Form multiple first hole 321 with the top of through-body 310, thus upper space 401a and bypass channel 100 are connected mutually.

The volume V2 of lower space 401b is greater than the volume V1 of upper space 401a.

In addition, form multiple second hole 322 with the bottom of through-body 310, thus lower space 401b and bypass channel 100 are connected mutually.

When considering that the amount of the working fluid introduced by pressure chamber 401 in low frequency part is more relatively large than HFS, preferably the diameter in the second hole 322 is greater than the diameter in the first hole 321.

In other words, to be greater than the fact of the volume V1 of the upper space of pressure chamber 401 relevant for the volume V2 of the diameter in the second hole 322 diameter and the lower space of pressure chamber 401 that are greater than the first hole 321.

Dotted line through the center in multiple first hole 321 is arranged on the first plane (P1 see Fig. 2), and it is identical plane.Dotted line through the center in multiple second hole 322 is arranged on (P2 see Fig. 2) in the second plane, itself and the first plane separation.In this way, level and smooth damping capacity can present at HFS and low frequency part.

At HFS, slide-valve 500 makes the first hole 321 and the second hole 322 maintain open mode.In low frequency part, slide-valve 500 moves up to cut out the first hole.

In addition, as mentioned above, the amount being caused the working fluid of the lower space 401b of pressure chamber 401 in low frequency part by the second hole 322 from bypass channel 100 is greater than the amount of the working fluid being caused lower space 401b at HFS by the second hole 322 from bypass channel 100.

On the other hand, as mentioned above, housing 400 mineralization pressure room 401 to settle following slide-valve 500, and comprises base plate 410, spacing wall 420 and the second intercommunicating pore 412.

That is, base plate 410 is attached to small diameter portion 610 to form bottom surface.Spacing wall 420 upwards extends from the edge of base plate 410 with mineralization pressure room 401.

Form multiple second intercommunicating pore 412 to pass base plate 410 and to allow working fluid to flow to the outside of the base plate 410 of low frequency part.

Therefore, at HFS, the second intercommunicating pore 412 is in closed condition by the second dish assembly D2, and therefore, working fluid is not expelled to below housing 400.But in the low frequency part that the flow of working fluid is high, the second dish assembly D2 allows elastic strain and opens the second intercommunicating pore 412, and therefore, working fluid is expelled to below housing 400.

In some cases, shell 400 can carry out multiple application and improvement.Such as, shell 400 can be one-body molded with above described holes assembly 300, or can removably be attached to above described holes assembly 300.

On the other hand, as mentioned above, slide-valve 500 to be placed in pressure chamber 401 and back and forth to move up and down according to the amount of the working fluid introduced in low frequency part and HFS.Slide-valve 500 comprises elevator 510, valve block 520, plate seam 530 and guide pad 540.

Elevator 510 is along the outward edge to-and-fro motion of aperture member 300.Reciprocal driving source is the working fluid introduced by the second hole 322 from pressure chamber 401 and discharge.

Valve block 520 is given prominence to the upper surface of ring-type from elevator 510.Valve block 800 is arranged on valve disc 520.

Plate seam 530 is multiple elements, and its formation direction along valve block 520 is cut and allowed the flowing of working fluid, and this working fluid is introduced from bypass channel 100 by the first hole 321 through the top of aperture member 300.

Guide pad 540 extends along the edge of elevator 510 and towards the inner side of housing 400.

First hole 321 is maintained open mode so that working fluid is discharged by the plate seam 530 of HFS by slide-valve 500.

Now, the first hole 321 is maintained closed condition so that working fluid is not discharged by the plate seam 530 of low frequency part by slide-valve 500.

In addition, O type ring O be arranged on guide pad 540 and housing 400 inner side between and prevent the leakage of working fluid.

On the other hand, the present invention obviously also can be applied to a kind of structure, and in the structure shown here, block piece 315 is formed in the top edge in the second hole 322 of the bottom through the main body 310 in the aperture member 300 of Fig. 2.

Thering is provided block piece 315 to occur for preventing following problem, namely when closedown the second hole 322, disturbing presenting of damping capacity due to elevator 510 excessive descent.

Obviously, block piece 315 can be changed by multiple application & design and manufacture.Such as, block piece 315 removably can be attached to the outward edge of main body 310 with C shape, or can by having the outstanding of specific trait or ring is formed, or can be one-body molded and outstanding with rib shape with main body 310.

Basic fundamental theory of the present invention is to provide the piston assembly for vibration damper, and it can improve ride comfort sense by the damping capacity presented in low frequency part and HFS.

According to the present invention, when the slide-valve reciprocally installed in the pressure chamber being placed in housing and along aperture member opens and closes the hole path at low frequency and HFS, suitably realize damping capacity, thus improve ride comfort sense by the damping characteristic of successively decreasing.

Especially, ride comfort sense can be improved by effectively preventing the small frequency affecting the HFS of ride comfort sense due to damping force according to the change of frequency.

Because slide-valve is settled in the housing and to-and-fro motion in a sliding manner, can reduction device total height thus make device compact.

In addition, to be assigned to assembling by minor diameter element orders being inserted piston rod, can manufacture process have been simplified thus reduction cost of production.

When describing embodiments of the invention according to specific embodiment, those skilled in the art can make multiple change when not departing from the spirit and scope of the invention limited in claims and amendment is apparent.

Claims

1., for a piston assembly for vibration damper, it comprises:

Bypass channel, its vertical length direction along piston rod is formed in small diameter portion, and described small diameter portion is located at the bottom of reciprocating piston rod in cylinder;

Main piston, it is connected to described small diameter portion;

Aperture member, it is attached to described small diameter portion and is arranged on to form hole path below described main piston, and it is communicated with described bypass channel;

Housing, it is attached to described small diameter portion and is arranged on below described aperture member, and described housing has the upside mineralization pressure room of opening; And

Slide-valve, it is attached to described aperture member and is placed in described pressure chamber, thus when producing damping force by passing through when HFS and low frequency part to-and-fro motion optionally to open and close described hole path.

2. piston assembly according to claim 1, wherein said aperture member and described housing one-body molded or be removably connected to described housing.

3. piston assembly according to claim 1, wherein said aperture member comprises:

Cylinder, its be attached to described small diameter portion and described slide-valve by described cylinder in low frequency part and HFS to-and-fro motion slidably;

Multiple first hole, the top of its through-body, thus make described bypass channel be attached to the upper space of described pressure chamber, described pressure chamber is divided into described upper space and lower space by described slide-valve; And

Multiple second hole, it through the bottom of described main body, thus makes described bypass channel be attached to the lower space of described housing.

4. piston assembly according to claim 3, the dotted line wherein through the center in described multiple first hole is arranged on the first plane, and

Dotted line through the center in described multiple second hole is arranged on the second plane with described first plane separation.

5. piston assembly according to claim 3, the volume of wherein said lower space is greater than the volume of described upper space.

6. piston assembly according to claim 3, the diameter in wherein said second hole is greater than the diameter in described first hole.

7. piston assembly according to claim 3, wherein at HFS, described first hole and described second hole are maintained open mode by described slide-valve.

8. piston assembly according to claim 3, wherein in low frequency part, described slide-valve moves up to cut out described first hole.

9. piston assembly according to claim 3, the amount of the working fluid wherein introduced from described bypass channel by described second hole in low frequency part is greater than the amount of the working fluid introduced from described bypass channel by described second hole at HFS.

10. piston assembly according to claim 1, wherein said slide-valve comprises:

Elevator, it is along the outward edge to-and-fro motion of described aperture member;

Valve block, it is given prominence to the upper surface of annular from described elevator, and valve disc is arranged on described valve block; And

Guide pad, its edge along described elevator extends and towards the inner side of described housing.

11. piston assemblys according to claim 10, wherein said slide-valve also comprises multiple plate seam, its formation direction along described valve block is cut and is allowed the flowing of described working fluid, and this working fluid is introduced from described bypass channel by described first hole on the top through described aperture member

Wherein at HFS, described first hole is maintained open mode so that described working fluid is discharged from described plate seam by described slide-valve, and

In low frequency part, described first hole is maintained closed condition so that described working fluid is not discharged from described plate seam by described slide-valve.

12. piston assemblys according to claim 10, wherein said piston assembly also comprises O type ring, prevents the leakage of described working fluid between its inner side being arranged on described guide pad and described housing.

13. piston assemblys according to claim 10, wherein said piston assembly also comprises block piece, and it is formed in the top edge in described second hole of the bottom through described aperture member and prevents described elevator from moving down.

14. piston assemblys according to claim 1, wherein said housing comprises:

Base plate, it is attached to described small diameter portion to form bottom surface;

Spacing wall, its edge from described base plate upwards extends to form described pressure chamber;

Multiple second intercommunicating pore, it passes described base plate and allows described working fluid to flow to the outside of the described base plate in low frequency part.